import java.util.*;
import java.lang.reflect.*;
/**
 * Created by ScorpionOrange on 2016/07/18.
 */
public class ReflectionTest {
    public static void main(String[] args){
        //read class name from command line args or user input
        String name;
        if(args.length > 0) name = args[0];
        else {
            Scanner in = new Scanner(System.in);
            System.out.println("Enter class name (e.g. java.util.Date):");
            name = in.next();
        }

        try{
            //print class name and superclass name (if != Object)
            Class cl = Class.forName(name);
            Class supercl = cl.getSuperclass();
            String modifiers = Modifier.toString(cl.getModifiers());
            if(modifiers.length() > 0) {
                System.out.print(modifiers + " ");
            }
            System.out.print("class " + name);
            if(supercl != null && supercl != Object.class) {
                System.out.print(" extends " + supercl.getName());
            }

            System.out.print("\n{\n");
            printConstructors(cl);
            System.out.println();
            printMethods(cl);
            System.out.println();
            printFields(cl);
            System.out.println("}");
        }
        catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        System.exit(0);
    }

    /**
     * Prints all constructors of a class
     * @param cl a class
     */
    public static void printConstructors(Class cl){
        Constructor[] constructors = cl.getDeclaredConstructors();
        for(Constructor c : constructors){
            String name = c.getName();
            System.out.print("  ");
            String modifiers = Modifier.toString(c.getModifiers());
            if(modifiers.length() > 0){
                System.out.print(modifiers + " ");
            }
            System.out.print(name + "(");

            //print parameter types
            Class[] paramTypes = c.getParameterTypes();
            for(int j = 0; j < paramTypes.length; j++){
                if(j > 0) {
                    System.out.print(", ");
                }
                System.out.print(paramTypes[j].getName());
            }
            System.out.println(");");
        }
    }

    /**
     * Prints all methods of a class
     * @param cl a class
     */
    public static void printMethods(Class cl){
        Method[] methods = cl.getDeclaredMethods();
        for(Method m : methods){
            Class retType = m.getReturnType();
            String name = m.getName();

            System.out.print("  ");
            //print modifiers, return type and method name
            String modifiers = Modifier.toString(m.getModifiers());
            if(modifiers.length() > 0){
                System.out.print(modifiers + " ");
            }
            System.out.print(retType.getName() + " " + name + "(");

            //print parameter types
            Class[] paramTypes = m.getParameterTypes();
            for(int j = 0; j < paramTypes.length; j++){
                if(j > 0) {
                    System.out.print(", ");
                }
                System.out.print(paramTypes[j].getName());
            }
            System.out.println(");");
        }
    }

    /**
     * Prints all fields of a class
     * @param cl a class
     */
    public static void printFields(Class cl){
        Field[] fields = cl.getDeclaredFields();

        for(Field f : fields){
            Class type = f.getType();
            String name = f.getName();
            System.out.print("  ");
            String modifiers = Modifier.toString(f.getModifiers());
            if(modifiers.length() > 0){
                System.out.print(modifiers + " ");
            }
            System.out.println(type.getName() + " " + name + ";");
        }
    }
}
